Sauropsida: Class Reptilia 

 mx 



169 



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V r ■ 



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\ 



y 



Pig. .'561. Dorsal and ventral views of the skull of a turtle. Trionyx. Compared 

 with the skull of the bony fish, that of reptiles shows increased compactness and 

 integration of elements, (bo) Basioccipital; (bs) basisphenoid; (eo, es) exoccipital; 

 (/) frontal; (./') zygomatic (jugal); (m, mx) maxilla; (n) prefrontal (naso-pre- 

 frontalP); (opis) opisthotic; (p) (behind orbit) postfrontal, (others) parietal; (pal) 

 palatine; (pm, pmx) premaxilla; (pno) prootic; (pt) pterygoid; (q) quadrate; (.v) 

 supraoccipital ; (») vomer. (Courtesy, Kingsley: "Comparative Anatomy of Verte- 

 brates," Philadelphia, The Blakiston Company.) 



Fig. 362. II void apparatus of a turtle. Trionyx. (b l , 

 b 2 ) First and second branchial arches; (bh) basihyal 

 (copula); (/() reduced hyoid. Cartilage dotted. (Cour- 

 tesy, Kingsley: 'Comparative Anatomy of Vertebrates," 

 Philadelphia, The Blakiston Company.) 



